github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 17:47:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

serial: 8250_dw: Use a fixed CPR value for UltraRISC DP1000 UART

Browse Source 
The UltraRISC DP1000 UART does not provide the standard CPR register used
by 8250_dw to discover port capabilities.

Provide a fixed CPR value for the DP1000-specific compatible so the
driver can configure the port correctly.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/20260429-ultrarisc-serial-v7-4-e475cce9e274@ultrarisc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia Wang 2026-04-29 17:13:28 +08:00 committed by Greg Kroah-Hartman
parent d22d2e54f6
commit 4a9a0b1a82
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/tty/serial/8250/8250_dw.c
View File

@ -959,6 +959,15 @@ static const struct dw8250_platform_data dw8250_intc10ee = {
.quirks = DW_UART_QUIRK_IER_KICK,
};
static const struct dw8250_platform_data dw8250_ultrarisc_dp1000_data = {
.usr_reg = DW_UART_USR,
.cpr_value = FIELD_PREP_CONST(DW_UART_CPR_ABP_DATA_WIDTH, 2) |
DW_UART_CPR_THRE_MODE |
DW_UART_CPR_DMA_EXTRA |
DW_UART_CPR_FIFO_MODE_FROM_SIZE(32),
.quirks = DW_UART_QUIRK_CPR_VALUE,
};
static const struct of_device_id dw8250_of_match[] = {
{ .compatible = "snps,dw-apb-uart", .data = &dw8250_dw_apb },
{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
@ -966,6 +975,7 @@ static const struct of_device_id dw8250_of_match[] = {
{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },
{ .compatible = "sophgo,sg2044-uart", .data = &dw8250_skip_set_rate_data },
{ .compatible = "starfive,jh7100-uart", .data = &dw8250_skip_set_rate_data },
{ .compatible = "ultrarisc,dp1000-uart", .data = &dw8250_ultrarisc_dp1000_data },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, dw8250_of_match);